Interface ReadOnlyFactStore

factstore/factstore.go:27–45

ReadOnlyFactStore provides read access to a set of facts.

// ReadOnlyFactStore provides read access to a set of facts.
type ReadOnlyFactStore interface {
	// Returns a stream of facts that match a given atom. It takes a callback
	// to process results. If the callback returns an error, or it encounters
	// a malformed atom, scanning stops and that error is returned.
	GetFacts(ast.Atom, func(ast.Atom) error) error

	// Contains returns true if given atom is already present in store.
	// This is a convenience method that has a straightforward implementation
	// in terms of GetFacts. It does not return error and treats any
	// error condition as "false". Clients who distinguish "absent" from "error"
	// should call GetFacts directly.
	Contains(ast.Atom) bool

	// ListPredicates lists predicates available in this store.
	ListPredicates() []ast.PredicateSym

	// EstimateFactCount returns the estimated number of facts in the store.
	EstimateFactCount() int
}

// FactStore provides access to a set of facts.
type FactStore interface {